Pragma - The home base for Ethereum developers.
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Telnyx SMS API - Build global text messaging right in your app
BuiltWith - Find out the technology behind websites
Notif.me SDK - A Node.js lib to send all your transactional notifications
WhatRuns - Extension that helps you identify technologies used on any website at the click of a button.